Across
- 5. a large cloud of gas and dust in interstellar
- 7. a gigantic explosion in which a massive star collapses and throws its outer layers into space
- 8. all of the wavelengths or frequencies of electromagnetic radiation
- 11. the brightness of a star as seen from earth
- 12. the actual brightness of a star
Down
- 1. a graph that shows the relationship between a stars surface temperature and absolute magnitude
- 2. a star that has collapsed under gravity
- 3. space and all the matter and energy in it
- 4. a small hot dim star that is left over center of an old sun like star
- 6. a measure of how bright a star would be seen from a standard distance
- 9. year the distance that light travels in a year
- 10. a collection of stars dust and gas bound together by gravity